05 1 13 Incorrect Fuel Gauge Reading.pdf


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Measure 1.1 gallons (4 liters) of fuel into the vehicle fuel tank using a funnel
to avoid spillage. Use an accurate means to measure the fuel.
The fuel tank now contains 2.6 gallons (10 liters) from empty.
Disconnect the vehicle wiring from the sender. Reconnect the multimeter
and check that reading is 735 ohms maximum. If the reading is greater than
735 ohms, add a maximum of 0.3 gallon (1 liter) of fuel. The reading should
now be 735 ohms or less. Reconnect the wiring and check that the low fuel
level warning light is OFF with the ignition ON.
If the low fuel level warning light remains ON with a reading of 735 ohms or
slightly less, the sender unit is not defective. If an incorrect warning lamp
indication is the only fault found, interrogate the instrument pack using the
PDU in the Diagnostic Mode.
Add 2.6 gallons (10 liters) of fuel to the tank. The gauge should now indicate
approximately 1/4 full.
The fuel tank now contains 5.3 gallons (20 liters) from empty.
Add another 5.3 gallons (20 liters). The gauge should now indicate
approximately 1/2 full.
The fuel tank now contains 10.6 gallons (40 liters) from empty.
Add another 5.3 gallons (20 liters). The gauge should now indicate
approximately 3/4 full.
The fuel tank now contains 15.9 gallons (60 liters) from empty.
Add another 5.3 gallons (20 liters). The gauge should now indicate full.
The fuel tank now contains 21.1 gallons (80 liters) from empty.
If the fuel tank accepts more than 21.1 gallons (80 liters), continue filling until
no more fuel is accepted. The specified capacity of the tank is 21.4 gallons
(81 liters) from “run dry”. The total amount that was added from step 8
above, indicates whether the tank is now actually full, and whether the 1.6
gallons (6 liters) from empty point was accurately achieved in step 6.
If fuel filling facilities are not available on the same premises, an accurate
allowance must be made in the procedure for fuel consumed while traveling
between the gas station and the workshop. Where appropriate, fuel should
be added to compensate before resistance measurements are made.

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Bulletin Number 05.1-13

Date of issue 7/96